build(deps-dev): bump @sa11y/jest from 6.11.0 to 6.12.1

Bumps [@sa11y/jest](https://github.com/salesforce/sa11y/tree/HEAD/packages/jest) from 6.11.0 to 6.12.1.
- [Release notes](https://github.com/salesforce/sa11y/releases)
- [Changelog](https://github.com/salesforce/sa11y/blob/master/CHANGELOG.md)
- [Commits](https://github.com/salesforce/sa11y/commits/v6.12.1/packages/jest)

---
updated-dependencies:
- dependency-name: "@sa11y/jest"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -35,7 +35,7 @@
     "devDependencies": {
         "@lwc/eslint-plugin-lwc": "^1.8.2",
         "@prettier/plugin-xml": "^3.4.1",
-        "@sa11y/jest": "^6.11.0",
+        "@sa11y/jest": "^6.12.1",
         "@salesforce/eslint-config-lwc": "^3.6.0",
         "@salesforce/eslint-plugin-aura": "^2.1.0",
         "@salesforce/eslint-plugin-lightning": "^1.0.0",